pid: 1234,

} as unknown as import("node:child_process").ChildProcess;

function firstMockCall(mock: { mock: { calls: unknown[][] } }, label: string): unknown[] {

const call = mock.mock.calls[0];

if (!call) {

throw new Error(`Expected ${label} to be called`);

}

return call;

}

describe("spawnLspServerProcess Windows .cmd shim handling", () => {

beforeEach(() => {

vi.clearAllMocks();

});

// Must use structured params so config.env entries are not dropped

const sanitizeParams = sanitizeHostExecEnvMock.mock.calls.at(0)?.[0] as

const sanitizeParams = firstMockCall(sanitizeHostExecEnvMock, "host env sanitization")[0] as

| { baseEnv?: NodeJS.ProcessEnv; overrides?: Record<string, string> }

| undefined;

expect(sanitizeParams?.baseEnv).toBe(process.env);

spawnLspServerProcess({ command: "typescript-language-server", args: ["--stdio"] });

const resolveParams = resolveWindowsSpawnProgramMock.mock.calls.at(0)?.[0] as

| { env?: Record<string, string>; allowShellFallback?: boolean }

| undefined;

const resolveParams = firstMockCall(

resolveWindowsSpawnProgramMock,

"Windows spawn resolution",

)[0] as { env?: Record<string, string>; allowShellFallback?: boolean } | undefined;

expect(resolveParams?.env).toBe(sanitizedEnv);

expect(resolveParams?.allowShellFallback).toBe(true);

});

spawnLspServerProcess({ command: "typescript-language-server", args: ["--stdio"] });

const spawnCall = spawnMock.mock.calls.at(0);

const spawnCall = firstMockCall(spawnMock, "child process spawn");

expect(spawnCall?.[0]).toBe("cmd.exe");

expect(spawnCall?.[1]).toEqual(["/c", "typescript-language-server.cmd", "--stdio"]);

const spawnOptions = spawnCall?.[2] as